The MRT system cannot meet passengers’ various demands for commuting, shopping, hospital visits, and recreation by only offering separate routes. In line with the development of the Taipei metropolitan area, the original plan for the Taipei MRT network was for it to be composed of the Xindian-Songshan line (Green Line), Tamsui-Xinyi line (Red line), Zhonghe-Xinzhuang-Luzhou line (Orange Line), Nangang-Banqiao-Tucheng line (Blue Line), and Wenshan-Neihu line (Brown Line) with each route identified by a color. After two decades of construction, the Taipei MRT system has been transformed from separate routes into a double-cross network. At the initial stage, most passengers were concentrated at Taipei Main Station and Zhongxiao Fuxing Station to transfer to other lines. After the Xinzhuang and Luzhou lines entered commercial service, passengers began getting used to turning to Minquan W. Rd. Station and Zhongxiao Xinsheng Station when making transfers. In the future, when the section from Zhongxiao Xinsheng Station to Guting Station via Dongmen Station on the Xinzhuang line Taipei City section is completed, two sections of the Orange Line will be linked. At that time, the in-service Guting Station on the Xindian line (Green Line) will allow passengers to transfer to the Xinzhuang line (Orange Line) at the opposite side of the platform that was planned for future use early in the initial construction stage. Then, operation modes and route connections will undergo a significant adjustment after Taipei MRT has been providing service for more than a decade. This article gives a brief overview of the considerations given to the formation of the MRT network and its operation modes in response to new route connections. Adjusted operation modes after the opening of the Xinzhuang line’s Guting Station, and system stability tests performed prior to the completion of the construction are also included.